#include <stdio.h>
main()
{
    int x;
    printf("Input number:");
    scanf("%d",&x);
    printf("number of decimal from: %d\n",x);
    printf("    it's binary from: ");
    printb(x, sizeof(int)*8);
    putchar('\n');

}
printb(x,n)
  int x, n;
  {
    if(n>0)
    {
        putchar('0'+ ((unsigned)(x&(1<<(n-1)))>>(n-1)));
        printb(x,n-1);
    }
  }